261006247 has 2 divisors, whose sum is σ = 261006248. Its totient is φ = 261006246.

The previous prime is 261006217. The next prime is 261006257. The reversal of 261006247 is 742600162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261006247 - 2¹⁹ = 260481959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261006217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130503123 + 130503124.

It is an arithmetic number, because the mean of its divisors is an integer number (130503124).

Almost surely, 2^261006247 is an apocalyptic number.

261006247 is a deficient number, since it is larger than the sum of its proper divisors (1).

261006247 is an equidigital number, since it uses as much as digits as its factorization.

261006247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 261006247 is about 16155.6877600429. The cubic root of 261006247 is about 639.0727514654.

The spelling of 261006247 in words is "two hundred sixty-one million, six thousand, two hundred forty-seven".